Adults = 9
Children = 2
Let x be the number of adults.
11-x is the number of children.
22x + 15(11-x) = 228
22x + 165 - 15x = 228
22x - 15x = 228 - 165
7x = 63
7x / 7 = 63 / 7
x = 9 number of adults.
11 - x = 11 - 9 = 2 number of children.
To check:
22x + 15(11-x) = 228
22(9) + 15(11-9) = 228
198 + 30 = 228
228 = 228
Answer:
x will be -1
How it is written: x > -1
Answer: The volume is 90.47 
Step-by-step explanation:
1. To solve this problem you need to use the formula for calculate the density, which is shown below:

Where
is the mass and
is the volume.
2. You must solve for the volume, as following:

3. Now, you must substitute the values of the mas and the density, which are given in the problem. Therefore, you have:

All you do is add 3.0 and 2.5
This would give u 5.5
Correct me if i'm wrong, but i hope it helps
this might help if any problem then ask.